.returnTop{
    position: fixed;
    bottom: 20px;
    right: 20px;
    display: none;
    width: 50px;
    height: 50px;
    font-size: 12px;
    color: aqua;
    line-height: 50px;
    border-radius: 50%;
    background-color: aqua;
    transition: 0.5s;
}
.returnTop:hover{
    border: 1px solid #000;
    color: aqua;
    background-color: #fff;
}